Rhizopus stolonifer is a common mold that often appears on spoiled food, especially bread and fruits. It has a fuzzy, black appearance due to its spore-producing structures. This mold thrives in warm, moist environments, making it easy to find in kitchens and pantries. Despite its unappealing look, Rhizopus stolonifer plays a role in nature by breaking down organic matter. It is also used in some food production processes, such as making certain types of fermented foods. However, it can be harmful if ingested in large amounts, as it may produce toxins.